Method of repairing a valve stem

Abstract

The application relates to a valve rod repairing method, which comprises the following steps: checking the valve rod, measuring and recording the size of the valve rod; removing the outer circle of the wear position of the valve rod; cutting the valve rod into a valve rod head and a valve rod foot; making a boss at the bottom end of the valve rod head, drilling a groove matched with the boss at the top end of the valve rod foot, and opening positioning holes on the two sides opposite to the boss and the groove, the positioning holes extending to the boss; making a valve rod sleeve according to the size of the removed outer circle, the valve rod sleeve needing to be wrapped to the joint of the valve rod head and the valve rod foot, and the valve rod sleeve also being opened and fixed through a locking screw opposite to the positioning holes; and re-installing the valve rod into the valve to confirm the use condition after the valve rod is repaired. The application is a repairing method for the wear caused by the friction between the valve rod and the packing, so that the waste of resources is reduced, the valve rod can be repaired for multiple times in the subsequent use, and the use effect of the valve rod is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of valve stem wear repair, and in particular to a valve stem repair method. Background Art

[0002] A valve is a device used to control the flow of gases, liquids, and gases or liquids containing solid powders in various pipelines and equipment. For manual valves that are frequently opened and closed, a section of the valve stem is fitted with the packing to complete the seal. Figure 1 The valve shown is a conventional globe valve, widely used in industries such as power generation, chemical engineering, dyeing and finishing, and medical treatment. For its specific structure, please refer to the globe valve with application number CN00220505.X. However, due to the frequent opening and closing of similar valves during use, friction between the valve stem and the packing often causes wear on the valve stem, leading to seal failure and leakage. The current solution for this leak is to simply replace the valve stem. However, this often occurs when the packing is worn while the rest of the valve stem is intact, resulting in a significant waste of resources. Summary of the Invention

[0003] To address the problems of the prior art, the present invention provides a valve stem repair method. This method addresses wear caused by friction between the valve stem and packing, eliminating the need for extensive material and procurement time, reducing repair costs and wasting resources. Furthermore, it allows the valve stem to be repaired multiple times during subsequent use without compromising its performance.

[0004] The valve stem repair method of the present invention comprises the following steps:

[0005] S1. Check the valve stem, measure and record the dimensions of the valve stem;

[0006] S2. Remove the outer ring of the worn position of the valve stem by turning;

[0007] S3, cutting the valve stem into two parts: a valve stem head and a valve stem foot;

[0008] S4. Form a boss at the bottom end of the valve stem head, drill a groove matching the boss at the top end of the valve stem foot, and open positioning holes on opposite sides of the boss and the groove, with the positioning holes extending to the boss;

[0009] S5. A valve stem sleeve is manufactured according to the size of the outer ring removed in step S2. The valve stem sleeve is wrapped around the connection between the valve stem head and the valve stem foot. A hole is also opened on the valve stem sleeve at a position corresponding to the positioning hole and the sleeve is fixed with a set screw.

[0010] S6. After the valve stem is repaired, it is reinstalled into the valve to confirm its use.

[0011] In one embodiment, in step S2, the outer ring is machined to a length sufficient to cover the contact area between the valve stem and the sealing packing area.

[0012] In one embodiment, in step S3, the valve stem is cut off at a position 10 to 20 mm upward from the worn position, and the worn position is completely cut off from the valve stem foot.

[0013] In one embodiment, in step S3, the valve stem head and the valve stem foot need to be reassembled and the total length is measured, and a length shortened for making the boss and the groove is reserved, and it is determined whether the length is sufficient to enable the top end of the valve stem to be higher than the upper cover and the handwheel to be installed after being installed in the valve. If so, the boss is directly machined out at the bottom end of the valve stem head; if not, a connecting rod is used instead when making the boss.

[0014] In one embodiment, the method of replacing the boss with a connecting rod is as follows: a mounting groove is opened at the bottom end of the valve stem head, a connecting rod is made and one end of the connecting rod is inserted into the mounting groove, holes are opened on the two opposite outer sides of the valve stem head at positions corresponding to the mounting grooves and extended to the connecting rod, the holes are fixed by set screws, and the boss is formed at the other end of the connecting rod.

[0015] In one embodiment, in step S5, the top end of the valve stem sleeve fits into the stepped portion formed between the valve stem head and the boss.

[0016] In one embodiment, a sealing ring is embedded between the bottom end of the valve stem sleeve and the valve stem foot.

[0017] In one embodiment, in step S1 , the size of the valve stem includes the length and diameter of the valve stem.

[0018] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0019] 1. This invention addresses the wear and tear caused by friction between valve stems and packing. By machining the old valve stem to remove defective areas, the stem is further processed into two parts. A new stem jacket replaces the defective area, allowing the valve stem to be repaired multiple times during subsequent use without affecting its performance. Because the jacket is small, commonly used pipe materials can be used, making it easy to prepare. Therefore, using this method to repair valve stems eliminates the need for extensive material procurement and reduces repair costs.

[0020] 2. Although this repair method will reduce the torsional strength and length of the valve stem, since it is a manual valve that is frequently opened and closed, the torque during opening and closing is small and will not cause damage to the valve stem. In addition, the old valve stem will have sufficient length margin. Reducing the length a little will only cause the handwheel height to drop a little. Even if there is no margin, only a connecting rod needs to be added between the valve stem head and the valve stem foot to save a lot of materials and procurement time, and also save repair costs to reduce waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the valve;

[0022] Figure 2 It is a schematic diagram of the assembly of the valve core and valve stem;

[0023] Figure 3 is a schematic structural diagram of a repaired valve stem according to the present invention;

[0024] Figure 4 It is a structural schematic diagram of the valve stem after the boss is replaced by a connecting rod in the present invention.

[0025] Explanation of the reference numerals: 1-valve stem, 11-valve stem head, 12-valve stem foot, 13-boss, 14-valve stem sleeve, 15-set screw, 16-connecting rod, 17-sealing ring, 2-valve core, 3-sealing packing area, 4-upper cover, 5-handwheel. DETAILED DESCRIPTION

[0026] The accompanying drawings are for illustrative purposes only and are not to be construed as limitations on this patent. To better illustrate this embodiment, some components of the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted from the accompanying drawings.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, which can be considered as internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0028] like Figure 2 As shown, after a period of use, when the valve stem 1 is removed, it is found that the contact area between the middle portion and the sealing packing area 3 is easily worn to varying degrees, which can greatly affect the sealing performance in severe cases. Therefore, the present invention provides a valve stem repair method, comprising the following steps:

[0029] S1. Check valve stem 1, measure and record the dimensions of valve stem 1;

[0030] S2. Remove the outer ring of the worn part of the valve stem 1 by turning it, which is equivalent to reducing the diameter of the worn part of the valve stem and removing the worn part;

[0031] S3, cutting the valve stem 1 into two parts: the valve stem head 11 and the valve stem foot 12;

[0032] S4. Make the bottom end of the valve stem head 11 into a boss 13, drill a groove that matches the boss 13 at the top end of the valve stem foot 12, and open positioning holes on opposite sides of the boss 13 and the groove, with the depth of the positioning holes extending to the boss 13;

[0033] S5. According to the size of the outer ring removed in step S2, the valve stem sleeve 14 is manufactured. The valve stem sleeve 14 needs to be wrapped around the connection between the valve stem head 11 and the valve stem foot 12. A hole is also opened on the valve stem sleeve 14 relative to the positioning hole and fixed with a set screw 15.

[0034] S6. After the valve stem 1 is repaired, reinstall it into the valve to confirm its use.

[0035] like Figure 3 As shown, the present invention addresses the wear caused by friction between the valve stem and the packing by repairing the valve stem 1. The defective portion of the old valve stem 1 is removed through machining, and the valve stem 1 is further processed into two components: a valve stem head 11 and a valve stem foot 12. A new valve stem sleeve 14 is then used to replace the defective portion of the old valve stem 1. This allows the valve stem 1 to be repaired multiple times during subsequent use without affecting its performance. Because the valve stem sleeve 14 is small in size, commonly used pipe materials can be used to meet processing requirements, making it easy to prepare. Therefore, using this method to repair the valve stem 1 can save a lot of time and money in purchasing materials, thereby reducing repair costs.

[0036] In addition, after the valve stem 1 is repaired, some additional valve stem sleeves 14 can be added as spare parts for storage. When the valve stem 1 is worn and leaks during future maintenance, there is no need to dismantle the valve. Instead, the valve stem 1 can be directly disassembled, the valve stem sleeve 14 and the packing in the sealing packing area 3 can be taken out and replaced with new ones to complete a quick repair. Therefore, further, in step S2, the length of the outer ring removed by turning covers the contact range between the valve stem 1 and the sealing packing area 3. When repairing wear, the length of the outer ring removed from the worn part of the valve stem 1 in step S2 can be relatively increased, so that the repaired valve stem 1 mainly relies on the valve stem sleeve 14 to contact the sealing packing area 3. In this way, in future wear repairs, it is no longer necessary to cut off the valve stem 1. It is only necessary to replace the valve stem sleeve 14 and reassemble it, saving materials and time.

[0037] In one embodiment, in step S3, the valve stem is cut off at a position 10 to 20 mm above the worn position, and the worn position is completely cut off from the valve stem foot. When the valve stem 1 is repaired for the first time, that is, when the one-piece old valve stem 1 is repaired and converted into a two-part assembly structure, due to uncertainty about the degree of wear and the actual situation, in order to prevent water leakage and other factors from causing penetrating erosion to the inside of the stem body, it is best to cut off the entire section when cutting off the worn position. Moreover, in step S3, the valve stem head 11 and the valve stem foot 12 need to be reassembled and measured for the total length, and the length shortened for making the boss 13 and the groove is reserved, and it is determined whether the length is sufficient to allow the top of the valve stem 1 to be higher than the upper cover 4 and the handwheel 5 to be installed after it is installed in the valve. If so, the boss 13 is directly machined out at the bottom end of the valve stem head 11, which is more convenient to make; if not, a connecting rod 16 is used instead when making the boss 13. Although the repair method of the present invention will reduce the torsional strength and length of the valve stem, since it is a manual valve that is frequently opened and closed, the torque during opening and closing is small and will not cause damage to the valve stem 1. In addition, the old valve stem 1 will have sufficient length margin. Reducing the length a little will only cause the height of the handwheel 5 to drop a little. Even if there is no margin, it is only necessary to add a connecting rod 16 between the valve stem head 11 and the valve stem foot 12 to save a lot of materials and procurement time, and also save repair costs to reduce waste of resources.

[0038] like Figure 4 As shown, the method of replacing the boss 13 with a connecting rod 16 is as follows: a mounting groove is opened at the bottom end of the valve stem head 11, a connecting rod 16 is made and one end of the connecting rod 16 is inserted into the mounting groove, holes are opened on two opposite outer sides of the valve stem head 11 at positions corresponding to the mounting groove and extended to the connecting rod 16, and the holes are fixed by set screws 15, so that the other end of the connecting rod 16 forms a boss 13. In this way, when the original old valve stem 1 is cut off, the valve stem head 11 is no longer shortened, but a connecting rod 16 is added to connect with the valve stem foot 12. This is equivalent to not reserving the distance to form the boss 13. At most, a small section of the old valve stem 1 that is severely worn is removed, and the remaining length of the original old valve stem 1 is sufficient to make up for this length.

[0039] Furthermore, in step S5, the top end of the valve stem sleeve 14 is fitted into the stepped portion formed between the valve stem head 11 and the boss 13. The valve stem sleeve 14 serves as a separating component between the valve stem 1 body and the sealing packing area 3. To facilitate assembly and fixation, the valve stem sleeve 14 rests against the bottom end of the valve stem head 11 and sleeves onto the valve stem foot 12. This facilitates assembly and disassembly, and precisely compensates for the worn surface of the old valve stem 1, ensuring a consistent overall diameter for the valve stem 1.

[0040] Furthermore, a sealing ring 17 is embedded between the bottom end of the valve stem sleeve 14 and the valve stem foot 12. Figure 3 and Figure 4As shown, the sealing ring 17 is additionally arranged to prevent the erosion of the internal structure by fillers or water leakage, and to make the connection between the valve stem sleeve 14 and the valve stem foot 12 more compact, avoiding the disassembly of the repaired valve stem 1. Moreover, in step S1, the size of the valve stem 1 is measured, including the length and diameter of the valve stem 1, so as to facilitate the subsequent manufacturing of the valve stem sleeve 14 and the judgment of whether the overall length of the valve stem 1 can be adapted to the original valve after repair.

[0041] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without the opposite description, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0042] In the drawings, the described positional relationship is only used for exemplary illustration and cannot be understood as a limitation on the present patent; obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A valve stem repair method, characterized in that: The following steps are involved: S1. Check the valve stem, measure and record the dimensions of the valve stem; S2. Remove the outer ring of the worn position of the valve stem by turning; S3, cutting the valve stem into two parts: a valve stem head and a valve stem foot; S4. Form a boss at the bottom end of the valve stem head, drill a groove matching the boss at the top end of the valve stem foot, and open positioning holes on opposite sides of the boss and the groove, with the positioning holes extending to the boss; S5. A valve stem sleeve is manufactured according to the size of the outer ring removed in step S2. The valve stem sleeve is wrapped around the connection between the valve stem head and the valve stem foot. A hole is also opened on the valve stem sleeve at a position corresponding to the positioning hole and the sleeve is fixed with a set screw. S6. After the valve stem is repaired, it is reinstalled into the valve to confirm its use.

2. A valve stem repair method according to claim 1, characterized in that: In step S2, the outer ring is machined to a length that covers the contact area between the valve stem and the sealing packing area.

3. A valve stem repair method according to claim 2, characterized in that: In step S3, the valve stem is cut off at a position 10 to 20 mm upward from the worn position, and the worn position is completely cut off from the valve stem foot.

4. A valve stem repair method according to claim 3, characterized in that: In step S3, the valve stem head and the valve stem foot need to be reassembled and measured for total length, with a reserved length shortened for making the boss and the groove, and a judgment is made as to whether the length is sufficient to enable the top end of the valve stem to be higher than the upper cover and the handwheel to be installed after being installed in the valve. If so, the boss is directly machined out at the bottom end of the valve stem head; if not, a connecting rod is used instead when making the boss.

5. A valve stem repair method according to claim 4, characterized in that: The specific method of replacing the boss with a connecting rod is as follows: a mounting groove is opened at the bottom end of the valve stem head, a connecting rod is made and one end of the connecting rod is inserted into the mounting groove, holes are opened on the two opposite outer sides of the valve stem head at positions corresponding to the mounting grooves and extended to the connecting rod, the holes are fixed by set screws, and the other end of the connecting rod forms the boss.

6. A valve stem repair method according to claim 1, characterized in that: In step S5, the top end of the valve stem sleeve fits into the stepped portion formed between the valve stem head and the boss.

7. A valve stem repair method according to claim 6, characterized in that: A sealing ring is embedded between the bottom end of the valve stem sleeve and the valve stem foot.

8. A valve stem repair method according to any one of claims 1 to 7, characterized in that: In step S1 , the size of the valve stem includes the length and diameter of the valve stem.

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